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A video is a sequence of still images (frames) displayed rapidly enough that the human eye perceives continuous motion. The threshold is usually around 24 frames per second (fps); below that, motion looks choppy, and above it, smoothness improves with diminishing returns. This definition applies to any medium that stores or streams such a frame sequence — a downloaded MP4, a live stream, or a screen recording. The sections below cover how video works technically, the formats and codecs you'll encounter, how it differs from animation and still images, and the quality factors that determine what you actually see.

How Video Works: Frames, Frame Rate, and Persistence of Vision

Video relies on two things working together:

• Discrete frames — each frame is a complete still image captured or rendered at a specific moment.
• Persistence of vision — the eye and brain briefly retain an image after it disappears, so when frames are shown in quick succession, the gaps between them are filled in and motion appears continuous.

Frame rate is the number of frames shown per second. Common values:

Higher frame rates produce smoother motion but also larger files, since more frames must be stored and transmitted.

Common Video Formats and Codecs

A video file is really two things bundled together: a container (the file format) and one or more codecs (the compression methods used inside it). The container holds the video stream, audio stream, subtitles, and metadata; the codec determines how each stream is compressed.

When each is used:

• MP4 with H.264 is the default choice when you need a file to play almost anywhere — phones, browsers, TVs, editors.
• WebM with VP9 or AV1 is used for web streaming where open, royalty-free codecs matter, and where file size is a priority.
• MKV is common when you want to keep multiple audio tracks or subtitles in one file without re-encoding.
• MOV with ProRes appears in professional editing workflows because it preserves quality for further processing, at the cost of very large files.

The codec matters more than the extension for quality and size. Two .mp4 files can look and behave very differently depending on whether they use H.264 or H.265.

Video vs. Animation vs. Still Images

These three are often confused because they all involve visual frames, but they differ in how the frames are produced and what they represent.

• Still image — a single frame. No motion, no time dimension. Examples: a JPEG photo, a PNG graphic.
• Video — a sequence of frames captured from the real world (or rendered to look real), played back at a set frame rate. The motion corresponds to something that happened in front of a camera or was recorded from a screen.
• Animation — also a sequence of frames, but each frame is created or manipulated rather than captured continuously. The motion is authored frame by frame or generated by software. A cartoon, a motion graphic, or a 3D render is animation.

The practical difference: video records motion that already exists; animation creates the illusion of motion from individually constructed frames. Both can use the same containers and codecs, so a .mp4 can contain either. The distinction is about production method, not file type.

The Video Pipeline: From Capture to Display

Understanding the pipeline helps explain why a video might look wrong at any stage.

1. Capture — a camera sensor samples light at a set resolution and frame rate, producing raw frames.
2. Encoding/compression — raw frames are compressed by a codec (e.g., H.264) to reduce size. This is where quality can be lost if the bitrate is too low.
3. Container packaging — the compressed video stream, audio, and metadata are written into a container like MP4 or WebM.
4. Storage or streaming — the file is saved, uploaded, or sent over a network. Streaming may split it into segments for adaptive delivery.
5. Decoding — the player reads the container, extracts the streams, and decompresses them back into frames.
6. Display — frames are shown on a screen at the intended frame rate. If the display refresh rate doesn't match, you may see judder or tearing.

A failure at any step — a bad capture, aggressive compression, a network stall, or a mismatched refresh rate — shows up as a visible problem for the viewer.

Key Quality Factors: Resolution, Bitrate, and Compression

Three factors determine how good a video looks and how large it is.

• Resolution — the pixel dimensions of each frame (e.g., 1920×1080, 3840×2160). Higher resolution preserves more detail but requires more data per frame.
• Bitrate — how much data is used per second of video, usually measured in Mbps or kbps. Higher bitrate means less compression and better quality, but larger files. The same resolution at a low bitrate will look blocky or blurry.
• Compression — the method used to reduce data. Lossy codecs (H.264, VP9) discard information the eye is less likely to notice; lossless codecs keep everything but produce much larger files. Compression efficiency (how good the video looks at a given bitrate) is the main reason newer codecs like H.265 and AV1 are adopted.

A useful rule: resolution sets the ceiling for detail, but bitrate and compression determine how much of that detail actually survives. A 4K video at a very low bitrate can look worse than a 1080p video at a healthy bitrate.

Quick Reference

• Video = frames + frame rate + persistence of vision.
• Container vs. codec: the container is the box, the codec is how the contents are packed.
• MP4/H.264 for compatibility; WebM/VP9 or AV1 for open web streaming; MKV for multi-track archival; MOV/ProRes for editing.
• Video vs. animation: video captures existing motion; animation constructs frames.
• Quality is governed by resolution, bitrate, and compression together — not by resolution alone.

Cascadeur's site offers a free way to try the software and links to paid plans, but the public page does not spell out exactly what the free tier includes or where its limits sit. What it does confirm is the feature set — AI-assisted keyframe animation, AutoPosing, AutoPhysics, Ragdoll, Inbetweening, AI motion generation, rigging, retargeting, and UE Live Link — plus file compatibility with .FBX, .DAE, .GLB/.GLTF, and .USD. If you need a definitive free-vs-paid breakdown, treat the Plans page and the trial start as the two places to check, because the homepage itself doesn't publish export limits, watermark rules, or commercial-use terms.

What the public page actually tells you

The homepage positions Cascadeur as "the easiest way to animate" and invites you to "Try for free" or "Watch demo." It lists these capabilities without marking any as paid-only:

• Inbetweening — AI interpolation that generates motion between keyframes
• Ragdoll — procedural reactions to impacts, falls, and collisions
• AutoPosing — get natural poses by moving fewer control points
• Quadrupeds — rigging, AutoPosing, and one-click retargeting for four-legged animals
• AI Motion Generation — running, jumping, combat, acrobatics, idles, and more
• AutoPhysics — a character double showing a physically accurate result, for tuning secondary motion and inertia
• Rigging — drag-and-drop joints to auto-generate a rig for humanoids and quadrupeds
• Retargeting — copy/paste animation between characters regardless of skeleton or proportions
• UE Live Link — stream animation to Unreal Engine with real-time updates

It also names the solution areas: mocap cleanup, previz, animation editing, AI, video games, prototyping, and markerless mocap. Mocap cleanup is described as fixing foot sliding, knee pops, geometry penetration, poses via AutoPosing, weight via AutoPhysics, and edits via Animation Layers.

None of this is labeled "free" or "paid" on the page, so don't assume the list equals the free tier.

The two "free" paths are different things

The page shows two separate entry points, and mixing them up is the most common source of confusion:

The trial link points to cascadeur.com/plans#trial, which means trial terms live on the pricing page, not the homepage. If your decision depends on whether you can keep using it indefinitely at no cost, that answer has to come from the Plans page — the homepage doesn't provide it.

When the free route is likely enough

Based on the feature list alone, a free or trial route is worth starting with if you are:

• Learning the workflow — testing AutoPosing and Inbetweening on a simple humanoid before committing
• Evaluating mocap cleanup — checking whether the foot-sliding and knee-pop fixes fit your pipeline
• Prototyping — blocking previz or game animation without a production deadline
• Testing file compatibility — confirming your .FBX, .DAE, .GLB/.GLTF, or .USD assets import cleanly

When upgrading becomes the real question

Upgrade pressure usually comes from constraints the homepage doesn't state, so verify each against the Plans page before paying:

1. Export restrictions — if the free tier limits resolution, format, or adds a watermark, that alone can force an upgrade for client work.
2. Commercial use — confirm whether free-tier output can be used in shipped products. The page doesn't say.
3. Team or pipeline needs — UE Live Link and retargeting matter more in production; check whether they're gated.
4. Volume of work — a single test animation and a full game's combat set have very different tolerance for limits.

A concrete example: if you're cleaning up a markerless mocap take for a game prototype and the free route lets you fix foot sliding and apply AutoPhysics, you may never need to pay. If you're delivering that animation into a commercial build and the free tier restricts export or licensing, the upgrade decision is made for you by the terms, not the feature list.

How to decide without guessing

1. Open the Plans page and read the actual tier comparison — this is the only authoritative source in the material provided.
2. Start the trial and test the specific features your project needs: AutoPosing, AutoPhysics, Ragdoll, Inbetweening, retargeting, and UE Live Link.
3. Test an export end-to-end with your real file format (.FBX, .DAE, .GLB/.GLTF, or .USD) and inspect the output for watermarks or quality loss.
4. Check the commercial-use terms in writing before shipping anything.
5. Only then compare cost against the limits you actually hit.

The homepage is useful for understanding what Cascadeur does — AI-assisted keyframe animation for character work, mocap cleanup, and game pipelines. It is not a pricing document. For the free-vs-paid question specifically, the Plans page is the answer, and the trial is how you verify it against your own project.